An event with a very high magnification is an important target for follow-up observations due to
the high chance of detecting planet-induced perturbations in the peak region of the light curve
[1]}. Despite the very high magnification, no followup observation was conducted
for KMT-2018-BLG-1743, because the KMTNet real-time AlertFinder [2]} only began
operation on 21 June 2018, that is, 40 days after the peak. Moreover, the AlertFinder was not
applied to field BLG31 until 2019.
